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Experimental study demonstrates activated charcoal promotes differentiation in plant tissue cultures by binding inhibitory metabolites, suggesting endogenous chemicals suppress morphogenesis.
Cell suspensions of Daucus carota and Haplopappus gracilis and callus suspensions of Allum cepa var. proliferum were grown in media with and without activated charcoal. Differentiation occurred in those Daucus and Allium cultures that contained charcoal. It was shown by mass spectrometry that the media without charcoal contained high amounts of phenylacetic acid and p‐OH‐benzoic acid (Daucus), 2,6‐OH‐benzoic acid (Allium) and benzoic acid, pelargonic acid and caprylic acid (Haplopappus), whereas the media with activated charcoal did not. It was also shown that p‐OH‐benzoic acid had inhibitory effects on the embryogenesis in Daucus cultures.
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Fridborg et al. (1978) studied this question.
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